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The number of Android smartphone and tablet users has experienced a rapidgrowth in the past few years and it raises users' awareness on the privacy andsecurity of their mobile devices. The features of openness and extensibilitymake Android unique, attractive and competitive but meanwhile vulnerable tomalicious attack. There are lots of users rooting their Android devices forsome useful functions, which are not originally provided to developers andusers, such as backup and taking screenshot. However, after observing thedanger of rooting devices, the developers begin to look for other non-rootalternatives to implement those functions. ADB workaround is one of the bestknown non-root alternatives to help app gain higher privilege on Android. Itused to be considered as a secure practice until some cases of ADB privilegeleakage have been found. In this project, we design an approach and implement acouple of tools to detect the privilege leakage in Android apps. We apply themto analyse three real-world apps with millions of users, and successfullyidentify three ADB privilege leaks from them. Moreover, we also conduct anexploitation of the ADB privilege in one app, and therefore we prove theexistence of vulnerabilities in ADB workaround. Based on out study, we proposesome suggestion to help developers create their apps that could not onlysatisfy users' needs but also protect users' privacy from similar attacks infuture.

Analyzing Use of High Privileges on Android: An Empirical Case Study of Screenshot and Screen Recording Applications